Aircraft



FIG. 1 is a front left front perspective view of the aircraft showing our new design.

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side view thereof.

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines show elements of the aircraft that form no part of the claimed design. 

CLAIM The ornamental design for an aircraft, as shown and described. 